Pump



Patentecl Jan. 28, 1936 UNITED STATES.

PATENT OFFICE Application April 7, 1934, Serial N0. 719,506 In Swltzerland April 13, 1933 4 Claims.

'Ihis invent-ion is partlcularly concerned 'With mecham'cal devices designed for use in the man= ufacture of artificial silk, filaments of which are formed by the extrusion of the cellulose composition through minute orifices from the container in which lt is held. in a semiliquid 01' pasty forxn. It is obviously neoessary that the filaments or threads shall be of uniform size throughout their lengthanol that, when lt ls considered that each filament of thread has a diameter no greater than a few one-thousandths of an inch, a slight irregularity in relative movement of the parts cf the mechanism employed in eifecting the extrusion of the cellulose composition through the orifice may ef'fect an undesirable variation in the diameter of the filament. The mechanism employed, which isin the natura of a pump ancl for so astopreventany such relative displacement of the working parts as might elfect a variatlon inthadiameter of the filament. -The invention is shown and explained herein as embodied in a pump. which comprises a freely floating cylinder b1ock rotatecl within a housing about itsaxis without rigidconnection with the actuating shaft er member and formed with a plurality of pump cylinders and plungers parallel With the axis of the cylinder block, a cooperating, stationary =liead formed. with channels through one of which a cellulose oomposition is drawn from the source 01 supply into each cylinder in turn and from the other Qf which the composition is forced to 45 gngi through the orifice cf extrusion by the action of each cylinder and piston in its turn. The cylinde r block is so held that lt cannot be displagied an axial direction from the cooperating head r norethan by the clearance necessary to 50 give a free working fit, and is so subject to the action of pressure devices that, notwithstanding its free fit within the housing, it cannot, under ordinary conditions of operation, be 'tilted within thehousing. ;The invention will be more fully 55 6Xplainedhereinafter with reference to the -ac-- companying drawing in which lt is illustrated, and in which:

Figure 1 is a view in longitudinal, axlal section of an extrusion device or pump constructed in accordance with the invention.

Figure 2 is a view of the same in end elevation as seen from the right hand in Figure 1.

Figure 3 is a view in transverse section on the plane indicated by the broken 1ine III-III of Figure 1, and.

Figure 4 is a view cf the same in elevationas seen from above in Figure 1.

The main body l of the pump, provided with bearing shoulders 2, is arranged to be securted firmly upon the filament machine, furnishes a suitable bearing for the actuating shaft 3, and is formed with a plane working face 4, the main body l thus constituting a working head for cooperation 'With the cylinder block hereinafter mentioned: The working head is formed in its face with an arcshaped suction channel 5 which is in communication through a duct 5 with the source of supply of the cellulose composition, and with 'a delivery channel 6 which is in coinmi1nication through a duct 6 with the extrusion orifice. The container for the cellulose composition ancl the extrusion orifice may be of usual sonstruction and arrangement and are not necessary to be shown.

The shaft 3 is formed at its end with a portion 3 which is polygonal in cross section and enters With a free fit the corresponding recess in the encl of a cylinder block l, circular in cross-section, which is thus structurally independent of the actuating shaft 3 and, though rotated thereby, is not rigid therewith but fioats freely wlthin the housing and has at its plane end face a true but free working contact with the working face 4 of the main body l. The cylinder block is held in position against the working head through*the medium of tension bolts 8 which are engaged withthe main body l, a bridge piece 9, a block 9% a ba1l bearing 9, and a spring Hl which is received within the central bore "l' of the cylinder block and through a washer lll bears against a shoulder l of the cylinder block. A housing H, which is itself independentof the main body l, receives the cylinder block With a free working fit and is retained by the bolts 8 and bridge piece 9, rotation of the housing being prevented by screws I2 which engage thebody l and. are threaclfird in the housing H. The tension bolts 8 have, as shown in the dravving, some clearance in the body! and in the bridge piece 9 whereb'Ythe to pressure in one direction, a spring 2 l, received housing can adapt itself to the cylinder block by whicn' alone it is carried so that no tilting meinentg can afiect the true fit cf the -cylinder block against thc Working face 3 of the body l. ihe housing and the oylinder block are thusin manner independent cf each other, that is, the one is capable cf a limitecl relative displacement With respect to the other.

In the cylincler block are formed several cylinders 'l parallel with the axis of the cylinder block and provided each with a long piston or plunger I5. Each piston l'5 is formed independently of :lts head ll which is re-ceiveol within a-- carrier l supported in the cylinder block and between the left hancl end of the carrier chamber and a collar l5 cf the piston is interposecl a spring 233 which presses the piston against its head l! and compensates for wear between thehead and a fixed annular Garn I3 whichis secured to the housing as by means of the block 9 .0f Which it maylorm a part and, in the rotation cf the cylinder block, at the proper time imparts, toeac'n piston H5 through the head. H itsforward or compression stroke. Also secured td the nousing adjacent the body l;is a fixed annvlar cam m .which, through slide bars E8, located in longitudinal grooves formeol in the periphery cf the body l, and pins 59 vvhlch engage the carriers 96 of the pistons I5, efiects, at the propertime, the rearwarol or suotion stroke of eac h piston i5 Each pin projeots through the wall cf the carrier into' a slot 15 in tine heacl l'E and there by a limited relative displacement an axial direction cf the head and. the carrier is permitted'. It Will be seen also that through the engagement'ofeach carrier With the pin I9 the pressure cf the spring 26 against the left band endof the carrier chamber serves to press the slide bar E8 against the cam' M. Wear between the cam 13 and the heads i'd, dn the one hancl, and. between the cam M and the slide b:ars E8, on the other band, is thus constaritly compensated notwithstandin-g the fact that the carrier block isitself freel -Y floating. 'It Will also be seen, that by this construction each piston has imparted to it by tne positive action cf the cams 93 and Hi definite, straight line movlement unafi"ected by lateral forces which would be inciclent to engagement with wabbling actuators setobliquely With 'respect to the axis of rotayielding pressure against the working face 4 without freeclom for longitudinal movement. T0 prevent any tilting E1ovement of the cylinoler block against the working face. 4 the cylinoler block and the housing are at all times subject within a seat formed. within tl1e housing and. bearing against the inner face oi the main body serving to exert such c'onstant pressure. The action of the Spring 2l may be supplemiented by a flat spring 22 secureol to the main body l diametrically opposite the spring 25 and bearing against the inner face cf aplate 22 secured to the housing. The weight of the housing and the cyli'ndfer blockvvhen the axi's 1's lzorizontal, as is usual, exerts a tilting moment which might result in a one-sicled wear of t'ne relatively movable parts, laut such tendency overcome by the construction and operation 01 the'mechanism employed. in the formation o1" filaments to be produceol is essential to the production o1" filaments of;uniform diameter, and to that encl the cylincler block must be hold with its plane end faoe in parallelism With the plane working face of the head so that the interposecl film cf composition'shall be cf uniform thickness throughou the pistons must be actuated by positive mea:

in bot'n directions, lateral components of the ton actuating force, whicb might tend toqlii place the cylincler block, inust be practil&lly eliminated. and compensated, and wear;between the pistons and their actuating devices znnst be compensatecl constantly. That these results may be accomplished certain features of improvements in the consti*uction and relaitions of 'parts of the mechanism -have been devised as hereinbefore. described and as set forth in the aocompany ing claims. i

lt Will be understood that various changes in detils cf const1uction and arrangement, particularly With respect 50 tl1e means foractuating the cylinoler block, rnay be made without departing from the spirit cf the invention, except so far, 'as may be pointed. out in the accom panyinp claims.

I claim as my invenizion: k

l. In an apparatus of the character described the Combination cf a working head. with a plane working face having arcuate suction and pries-- sure channels, a cup-shaped housing, a cylinder block irotatable in the housing and having'a plurality cf cylinders arranged for communitzati-on with sail channels in the rotation of said cylin-' der block, pistons for said. cylinders, means r'or reciprbcatingsaid pistons' in the rotation cf said cylinder block, a spring arranged between said cylihcler block and. the closed. end cf tl1e holising to press the cylinder block against tl1e working facje ofithe working head, a.clearancebeing providecl between the open encl cf the housing and the Working head, tension means taking up the reaction cf said spring and limiting the clearance betweeri the housirig and the working head with capacity for limited tilting movement of tl1e housing 'with respect to thworking head.

2. In an apparatus cf the character described' the combination cf awbrking head'with a plane;

working face having arcuate suction andpressure channels, a cup-shaped housing, a cylinder block rotatable in the housing and. having a plurality cf cylinders arranged for communication with said channels in the rotation cf said cylincler block, pistons for said cylinclers, means for rec iprocating said pistons in the rotatiori 0f said' cylinclerblock, a spring arranged between thecylihder block and the closed. encl of the housing to press the cylinder block asainst the working 'face of the workinglcead, a clearance being provided oetween the open end of the housing and the werking headtension means taking up the reaction of the spring and limiting the interval between the housing and. the working head with capacity for limited tilting movement of the housing With respect to the working head, and yielding means eifective between the working head and housing 120 counteract the tilting movement resulting from weight of said housing and. cylinder block and thereby prevent one-sided wear of the Working face.

3. In an apparatus of the charaoter desoribed the combination of 2, working head with arcuate suction and pressure channels, a housing, a, cy1- inder block rotatable in the housing and having a plurality of cylinders arranged for oommunication with said channels in the rotation of the cylinder block, pistons for said cylinders, a, suction cam fixed in seid housing and in operative relation with the hereinafter named slide bars to effect positively the suction stroke of the pistons, a pressure cam fixed in the housing and in operative relation with the pistons to effect positively the pressure stroke of said pistons, s1ide bars arranged in the cylinder block in parallelism with said oylinders, and comp=ressed springs arranged in operative relation with seid pistons and said slide bars and pressing seid pistons towards said pressure cam and said slide bars towards said suction cam to compensate for wear.

4. In an apparatus of the charaoter described the oombination of a working head with arcuate suotion and pressure channels, a housing, a cylinder block rotatable in the housing and having a plurality of cylinders arranged for communication with the channels in the rota.tion of said cy1- inder block, pistons for said cylinders, a suction cam fixed in said housing and in operative relation with the hereinafter named slide bars to efiect positively the suction stroke of the pistons, a pressure cam fixed in said housing and in operative relation with the pistons to effect positively the pressure stroke of the pistons, s1ide bars arranged in the cylinder block in parallelism with the cylinders a.nd cooperating with seid suction cam, piston carriers arranged in the cylinder block in alinement with said pistons and operative1y connected with the s1ide bars, the carriers being formed with recesses, piston heads slidably arranged in the piston carriers and cooperating With the pressure cam anal the pistons, collars on the pistons, and compressed springs arranged in operative relation with the collars and said recesses to press seid pistons against said piston heads and seid piston carriers against the s1ide ba1s 130 compensate for wear.

ROBERT DE STOUTZ. 

